SEROSITY

serosity. Serosity, n. the thin or watery part of the blood

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Se‐ros″i‐ty (?), n. [[Cf. F. serosité. See Serous.]] 1. 1. The quality or state of being serous.
2. 2. (Physiol.) A thin watery animal fluid, as synovial fluid and pericardial fluid.